Encina Leonidas, Elgueta Elizabeth, Rivas Bernabé L, Pereira Miguel, Sanhueza Felipe
Polymer Department, Faculty of Chemistry, University of Concepción Casilla 160-C Concepción Chile
Centro de Investigación de Polímeros Avanzados, CIPA Avenida Collao 1202, Edificio de Laboratorios Concepción Chile
RSC Adv. 2021 Nov 8;11(57):35960-35972. doi: 10.1039/d1ra06278f. eCollection 2021 Nov 4.
The adsorption of Cu(ii), Cd(ii), and Pb(ii) ions onto hydrogels derived from modified galactoglucomannan (GGM) hemicellulose was studied. GGM hemicellulose was modified with methacrylate groups (GGM-MA) to incorporate vinyl groups into the polymeric structure, which reacted later with synthetic monomers such as 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS). The results show that all the synthesized hydrogels were capable of adsorbing contaminating ions with high adsorption efficiency during short periods of time. Furthermore, an increase in the content of GGM-MA generated a hydrogel (H3) with a similar ion adsorption property to the other hydrogels but with a lesser degree of swelling. The H3 hydrogel had an adsorption capacity of 60.0 mg g Cd(ii), 78.9 mg g Cu(ii), and 174.9 mg g Pb(ii) at 25 °C. This result shows that modified GGM hemicelluloses can be employed as renewable adsorbents to remove Cu(ii), Cd(ii), and Pb(ii) ions from aqueous solutions.
研究了铜（II）、镉（II）和铅（II）离子在改性半乳甘露聚糖（GGM）半纤维素衍生水凝胶上的吸附情况。GGM半纤维素用甲基丙烯酸酯基团（GGM-MA）进行改性，以便将乙烯基引入聚合物结构中，随后该结构会与诸如2-丙烯酰胺基-2-甲基-1-丙烷磺酸（AMPS）等合成单体发生反应。结果表明，所有合成的水凝胶都能够在短时间内以高吸附效率吸附污染离子。此外，GGM-MA含量的增加产生了一种水凝胶（H3），其离子吸附性能与其他水凝胶相似，但溶胀程度较小。H3水凝胶在25℃下对镉（II）的吸附容量为60.0 mg/g，对铜（II）为78.9 mg/g，对铅（II）为174.9 mg/g。这一结果表明，改性GGM半纤维素可作为可再生吸附剂用于从水溶液中去除铜（II）、镉（II）和铅（II）离子。
